This is a rather weird-looking exercise, but it's a very effective way to build the whole deltoid with an emphasis on the lateral portion.
Basically, the movement is like performing a one-arm lateral raise while the other arm is brought up with the elbow bent at a 90 degree angle. The bent arm doesn't do much work because of the advantageous lever, but it allows you to keep some tension on the shoulder muscle during the whole exercise. Constant tension equals more growth!
"Every day, I hear someone say, 'I'm too fat. I need to lose 25 pounds, but I can't. I never seem to improve.' I'd hate myself if I had that kind of attitude, if I were that weak. I can lose 10-40 pounds rapidly, easily, painlessly, by simply setting my mind to it. By observing the principles of strict discipline that bodybuilding taught me, I can prepare myself for anything."
So, Mike sat in my front room after a six hour drive from Las Vegas to Salt Lake City and asked a simple question: "Dan, why do people ask you to coach them?"